Imaging and biomarker data are available on a subset of UDS participants. These data are most appropriately described as a convenience sample, voluntarily submitted by several Alzheimer’s Disease Research Centers (ADRCs). The imaging available on a subset of UDS participants is primarily MRI and associated volumetric data. Biomarker data is in the form of CSF values for Abeta, P-tau, and T-tau. Limited genetic data is available at NACC (i.e., APOE genotype, recorded for more than 75% of participants); more genetic data are available from our partners.